MemGUI-Bench: Benchmarking Memory of Mobile GUI Agents in Dynamic Environments

Reliable mobile GUI agents must retain and reuse information across actions, applications, and repeated interactions. However, current benchmarks systematically underrepresent these memory demands: only 5.2-11.8 percent of their tasks are memory-related, and none evaluates cross-session learning. We introduce MemGUI-Bench, a comprehensive memory-centric benchmark that assesses both short-term information retention and long-term experience accumulation through pass@k protocols and staged LLM-as-judge evaluation. Our contributions include: (1) a systematic taxonomy of short- and long-term memory based on 11 agents across 5 architectures; (2) a snapshot-based suite of 128 tasks across 26 applications, organized into 64 mirror pairs, where 89.8 percent require cross-temporal and cross-spatial retention; (3) MemGUI-Eval, an automated 3-stage Progressive Scrutiny pipeline with 7 hierarchical metrics spanning memory fidelity, learning effectiveness, and execution efficiency; and (4) an assessment of 11 state-of-the-art agents guided by 6 research questions. Our experiments reveal substantial memory deficits across all evaluated systems, including 4-10x capability gaps on memory-intensive tasks. They further show that short-term memory is indispensable, while explicit long-term memory improves cross-session learning by 21.9 percentage points, with cross-application transfer and computational cost remaining major bottlenecks. We additionally identify 5 distinct failure modes and synthesize 5 actionable design implications for future memory-enhanced agents. All resources, including code, benchmark, and evaluation results, will be fully open-sourced and continuously maintained at https://memgui-bench.github.io/.